1. What can I do now?
You could try using a transaction accelerator like viabtc or doing a CPFP if possible as it is very easy on mycelium. The option is at the vertical three dots when you clicked the unconfirmed transaction in the "Transactions" tab. Can you also post the TXID here?
2. When I'm checking final bilance of my recent bitcoin address in blockchain.info, it says the 0 (even If I see some btc like on the screenshot), why?
What screenshot?
Are you asking why your address shows 0BTC in block explorers even though it is stated in your app that you some?? Then the answer should be simple and that is because your wallet doesn't contain only one address which is why it's no wonder that you didn't get the total amount of bitcoins you have in mycelium using a single address when you viewed it in a block explorer e.g. blockchain.info.
You probably entered an address which doesn't have any bitcoins in it.
To know if an address has a balance or not try following this: Go to your Accounts tab --> Click an account --> Vertical three dots --> Show Unspent Outputs